CN210004778U

CN210004778U - Boiler nitrogen oxide emission reduction device

Info

Publication number: CN210004778U
Application number: CN201822175786.7U
Authority: CN
Inventors: 蔡惠勇; 陈欣聪; 苏荫来; 王青森; 王建永
Original assignee: Limited By Share Ltd Tun He Sugar Industry; Cofco (tangshan) Sugar Co Ltd
Current assignee: Limited By Share Ltd Tun He Sugar Industry; Cofco (tangshan) Sugar Co Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-01-31
Anticipated expiration: 2028-12-24

Abstract

The utility model relates to an emission reduction device technical field for boiler, boiler nitrogen oxide emission reduction device, it includes the boiler, the dust remover, the desulfurization absorption tower, chimney and times fan, the boiler includes boiler body, cyclone and inclosed flue, is equipped with out the cigarette end on boiler body's upper portion, is equipped with the intercommunication end in boiler body's lower part, boiler body's play cigarette end and cyclone's upper portion feed end fixed connection is in play, cyclone's bottom discharge end and boiler body's intercommunication end are connected and are played the utility model discloses rational in infrastructure and compact, convenient to use, through the cooperation of boiler, dust remover, desulfurization absorption tower, chimney and times fan use, realize flue gas denitration and desulfurization purpose, have safe and reliable, denitration and desulfurization effectual characteristics, made things convenient for the operation, improved work efficiency, reduced environmental pollution and manufacturing cost, can be fine reach the environmental protection requirement.

Description

Boiler nitrogen oxide emission reduction device

Technical Field

The utility model relates to a boiler is with reducing discharging device technical field is boiler nitrogen oxide reduce discharging devices.

Background

An enterprise for refining sugar 50 ten thousand tons in the year uses circulating fluidized-bed coal-burning boilers, the boilers adopt flue gas purification systems of electric-bag dust removal, Na-Ca double-alkali desulfurization and SNCR denitration, the boilers matched with the device are XD-90/3.82-M1 type boilers, the coal-burning boilers have medium-temperature and medium-pressure parameters, single drum, natural circulation, medium-temperature gas-solid separation and low-circulation multiplying power circulating fluidized-bed combustion modes, the denitration adopts SNCR denitration by spraying ammonia at a high-temperature section in the boiler, the reaction temperature is 870-1100 ℃, no catalyst is needed, NH is needed, and₃with NO_XReaction to produce N₂And H₂O, the denitration purpose is achieved, the SNCR denitration has the advantages of less project investment, but the denitration efficiency is 35 to 45 percent in the common way, and NH₃The escape rate is 5 to 10PPm, and the ammonia water has the unsafe factors of -fixed toxicity, explosiveness and the like, and the ammonia water is required to be strictly controlled in daily operation and is provided with corresponding alarm equipment.

In order to make up the deficiency of low SNCR denitration efficiency, smoke gas recirculation fans are reconfigured to the boiler, and the flow rate is 10000m³H, wind pressure6000pa, adopting an air inlet mode on a bed, aiming at causing a working environment of oxygen deficiency combustion and inhibiting the generation of nitrogen oxides, simultaneously starting SNCR and flue gas recirculation air denitration under the high-load working condition of a boiler, and leading the flue gas emission to be barely up to the standard, but under the condition of low boiler load, because times of air cannot be lower than the lowest fluidization air quantity, NOx generated in the excess air combustion process seriously exceeds the national emission standard, the flue gas emission is not up to the standard, the boiler must be shut down, and the embarrassment of production stop is faced.

For denitration of flue gas of a coal-fired boiler, SNCR or SCR denitration technology is adopted for treatment at present , the SNCR and flue gas circulating air denitration cannot reach the flue gas emission standard, if the SNCR and the flue gas circulating air denitration system is modified, the efficiency is over 90 percent, the reaction temperature is ℃ to 400 ℃, and NH is generated₃The escape rate is 3-5 PPm, but the flue gas needs to be led out after the high-temperature economizer, and then the flue gas enters a newly-built SCR denitration device, and then the flue gas is led into the inlet of the low-temperature economizer at the tail part of the boiler, so that the modification workload is large, the investment cost is high, about 800 ten thousand yuan is needed, the catalytic activity of alkaline oxides in the dust can be passivated, times of catalyst replacement are needed every three years, and the catalyst can generate 40mmH for the flue gas₂O to 60mmH₂The pressure loss of O and the operation cost are high; based on above reasons, current device running cost is high, and the denitration effect is poor to lead to the fume emission not up to standard, can not satisfy the environmental protection requirement.

Disclosure of Invention

The utility model provides an boiler nitrogen oxide emission reduction devices has overcome above-mentioned prior art not enough, and it can effectively solve current device running cost height, and the denitration effect is poor to lead to the fume emission not up to standard, can not satisfy the problem of environmental protection requirement.

boiler nitrogen oxide emission reduction device, including the boiler, the dust remover, the desulfurization absorption tower, chimney and fan, the boiler includes boiler body, cyclone and inclosed flue, be equipped with out the cigarette end on boiler body's upper portion, be equipped with the intercommunication end in boiler body's lower part, boiler body's play cigarette end and cyclone's upper portion feed end fixed connection play, cyclone's bottom discharge end and boiler body's intercommunication end are connected play, cyclone's top play cigarette end and flue's upper portion advance cigarette end fixed connection play, flue's lower part play cigarette end and dust remover advance cigarette end are through pipeline connection at play, the play cigarette end of dust remover and desulfurization absorption tower's lower part advance cigarette end are connected at play through the second pipeline connection, the top play cigarette end of desulfurization absorption tower and the flue advances cigarette end of chimney through third pipeline connection at 367 play cigarette end with the cigarette end of dust remover, be equipped with and the second intake air inlet duct fixed connection at the boiler body's outer side of the air outlet pipe line and flue, the air inlet fan group is equipped with the sixth fan group through the second pipeline connection on the exhaust pipe line and the fifth pipeline connection on the boiler body, the exhaust pipe line of the sixth fan group is equipped with the exhaust pipe line and the fifth pipeline connection on the sixth fan group, the exhaust pipe line of the exhaust fan group is equipped with the fifth pipeline on the exhaust fan group, the fifth pipeline of the exhaust pipe line is equipped with the fifth pipeline on the exhaust fan group, the exhaust pipe line of the fifth pipeline group, the fifth pipeline group of the exhaust fan group of the fifth pipeline group is equipped with the fifth pipeline on the fifth pipeline of the fifth pipeline group of the fifth pipeline of.

The following is steps of optimization or/and improvement of the technical scheme of the utility model:

above-mentioned heat exchanger group includes level air heater and second grade air heater, level air heater and second grade air heater are fixed mounting respectively in the inner chamber lower part of flue, 0 level air heater is located second grade air heater's top, be equipped with the air inlet end respectively in 1 level air heater and second grade air heater's lower part, be equipped with the air-out end respectively on level air heater and second grade air heater's upper portion, time the air-out end of fan and second grade air heater's air inlet end pass through the fourth pipe connection and play , second grade air heater's air-out end and level air heater's air inlet end are connected at , level air heater's air-out end and boiler body's the first air inlet end are through the fifth pipe connection at plays.

The aforesaid is equipped with the th air inlet end in the right side lower part of boiler body, is equipped with the second air inlet end in the left side lower part of boiler body, and level air heater's air-out end and the th air inlet end of boiler body pass through the fifth pipe connection at , are connected with the sixth pipeline between the second air inlet end of second pipeline and boiler body.

The air inlet end of the -time fan is connected with an air inlet pipe, and a silencer and an electric air are fixedly arranged on the air inlet pipe respectively.

The fifth pipeline and the sixth pipeline are connected with a communicating pipe, an electric butterfly valve is fixedly arranged on the communicating pipe, a pneumatic baffle valve and a manual butterfly valve are respectively and fixedly arranged on the sixth pipeline, electric air is fixedly arranged on the second pipeline between the induced draft fan and the desulfurization absorption tower, and electric air is fixedly arranged on the third pipeline.

The dust remover is an electric dust remover.

The utility model has the advantages of reasonable and compact structure, convenient to use uses through the cooperation of boiler, dust remover, desulfurization absorption tower, chimney and times fan, realizes flue gas denitration and desulfurated purpose, has safe and reliable, denitration and the effectual characteristics of desulfurization, has made things convenient for the operation, has improved work efficiency, has reduced environmental pollution and manufacturing cost, can be fine reach the environmental protection requirement.

Drawings

FIG. 1 is a process flow diagram of the preferred embodiment of the present invention.

In the attached drawing, the codes are respectively that 1 is a dust remover, 2 is a desulfurization absorption tower, 3 is a chimney, 4 is an -time fan, 5 is a boiler body, 6 is a cyclone separator, 7 is a flue, 8 is a pipeline, 9 is a second pipeline, 10 is a third pipeline, 11 is a fourth pipeline, 12 is a fifth pipeline, 13 is a sixth pipeline, 14 is an induced draft fan, 15 is a flue gas recirculation fan, 16 is a -stage air preheater, 17 is a secondary air preheater, 18 is an air inlet pipe, 19 is a silencer, 20 is electric air , 21 is a communicating pipe, 22 is an electric butterfly valve, 23 is a pneumatic baffle valve, and 24 is a manual butterfly valve.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.

The present invention will be described in with reference to the following embodiments and accompanying drawings:

as shown in the attached drawing 1, the boiler nitrogen oxide emission reduction device comprises a boiler, a dust remover 1, a desulfurization absorption tower 2, a chimney 3 and a secondary fan 4, wherein the boiler comprises a boiler body 5, a cyclone separator 6 and a closed flue 7, a smoke outlet end is arranged at the upper part of the boiler body 5, a communicating end is arranged at the lower part of the boiler body 5, the smoke outlet end of the boiler body 5 and the upper feeding end of the cyclone separator 6 are fixedly connected to , the bottom discharging end of the cyclone separator 6 and the communicating end of the boiler body 5 are connected to , the top smoke outlet end of the cyclone separator 6 and the upper smoke inlet end of the flue 7 are fixedly connected to , the lower smoke outlet end of the flue 7 and the smoke inlet end of the dust remover 1 are connected to through a pipeline 8, the smoke outlet end of the dust remover 1 and the lower smoke inlet end of the desulfurization absorption tower 2 are connected to 894 through a second pipeline 9, the top smoke outlet end of the desulfurization absorption tower 2 and the flue inlet end of the desulfurization absorption tower 2 are connected to an inlet flue 2 through a second pipeline 9, the flue 6 and a flue 6 are connected to a flue 6, the flue 2, the flue is connected to a flue 6, the flue of the flue 6, the flue 2, the flue is connected to a flue 2, the flue of a flue 6, the flue of a flue gas inlet pipeline 2, the flue gas inlet pipe of a flue gas inlet pipe is connected to a flue gas inlet pipe of a flue gas inlet pipe, the flue gas inlet pipe of a flue gas outlet pipe of a flue gas inlet pipe of.

According to actual needs, the boiler nitrogen oxide emission reduction device can be optimized or/and improved by steps:

as shown in the attached drawing 1, the heat exchanger group comprises -stage air preheaters 16 and 17, -stage air preheaters 16 and 17 are respectively and fixedly installed at the lower part of an inner cavity of a flue 7, 0-stage air preheater 16 is positioned above the secondary air preheater 17, air inlet ends are respectively arranged at the lower parts of 1-stage air preheater 16 and 17, air outlet ends are respectively arranged at the upper parts of 2-stage air preheater 16 and 17, 3-stage air outlet end of a secondary fan 4 and the air inlet end of secondary air preheater 17 are connected with through a fourth pipeline 11, the air outlet end of secondary air preheater 17 and the air inlet end of -stage air preheater 16 are connected with , the air outlet end of -stage air preheater 16 and the air inlet end of of a boiler body 5 are connected with through a fifth pipeline 12, -stage air preheater 16 and secondary air preheater 17 can be a common heat exchanger, thus, air entering the boiler body 5 firstly passes through the secondary air preheaters 17 and , enters the inner cavity of the flue 7, and then enters the flue gas of the boiler body to be preheated.

As shown in the attached figure 1, the th air inlet end is arranged at the lower part of the right side of the boiler body 5, the second air inlet end is arranged at the lower part of the left side of the boiler body 5, the air outlet end of the -stage air preheater 16 and the th air inlet end of the boiler body 5 are connected to through the fifth pipeline 12, and the sixth pipeline 13 is connected between the second pipeline 9 and the second air inlet end of the boiler body 5, so that parts of the flue gas in the desulfurization absorption tower 2 can enter the boiler body 5 through the sixth pipeline 13, the flue gas is recycled, part of air volume is replaced, the oxygen content of air is reduced on the premise of not influencing fluidization, the oxygen-deficient combustion is realized, the generation of nitrogen oxides is inhibited, the index is reduced, even an SNCR system does not need to be used, the environmental protection requirement can be met, and the environmental protection bottleneck is solved.

As shown in figure 1, an air inlet pipe 18 is connected to the air inlet end of the times blower 4, and a silencer 19 and an electric air 20 are fixedly mounted on the air inlet pipe 18 respectively, so that the electric air 20 can control the air inlet amount, and the silencer 19 can better eliminate noise.

As shown in the attached figure 1, a communicating pipe 21 is connected between the fifth pipeline 12 and the sixth pipeline 13, an electric butterfly valve 22 is fixedly arranged on the communicating pipe 21, a pneumatic baffle valve 23 and a manual butterfly valve 24 are respectively fixedly arranged on the sixth pipeline 13, electric air 20 is fixedly arranged on the second pipeline 9 between the induced draft fan 14 and the desulfurization absorption tower 2, and electric air 20 is fixedly arranged on the third pipeline 10, so that air preheated by air can be mixed with flue gas in the sixth pipeline 13 and then enter the boiler body 5.

The dust remover 1 is an electric dust remover according to the requirement. Therefore, the electric bag dust remover can better play a role in dust removal.

The utility model discloses beneficial effect contrast around reforming transform

Before transformation, the SNCR system is used alone, and when the boiler load is 70% or below, the nitrogen oxide index can only be controlled at 300mg/Nm³To 400mg/Nm³About, the index of 100mg/Nm is far from being satisfied³The boiler can not be normally put into operation; if the load is above 75%, the nitrogen oxide index is 150mg/Nm³To 200mg/Nm³On the left and right, the SNCR system was put into service at a cost of about 6 x 1200=7200 yuan/day and a gas yield per ton of coal of about 6.6.

After transformation, parts of flue gas in the desulfurization absorption tower 2 can enter the boiler body 5 through a sixth pipeline 13 during low load, the flue gas is recycled, part of air volume is replaced, the air oxygen content of times is reduced on the premise of not influencing fluidization, under-oxygen combustion is realized, the generation of nitrogen oxides is inhibited, the index is reduced, even an SNCR system is not used, the environment-friendly requirement is met, the environment-friendly bottleneck is solved, if the air inlet type fluidized bed boiler operates in an air inlet mode, the treatment cost is about 268 yuan/day, the fuel utilization rate is reduced due to the under-oxygen combustion, the gas yield per ton of coal is reduced by about 6.3, the cost is 268+5702=5970 yuan/day, if the air inlet type fluidized bed operates in an air inlet mode, the electricity cost is kept flat, the cost is determined by the coal consumption per ton, 1/6.3-1/6.6=0.0072, 0.0072 is 60 = 550, the electricity cost is kept flat, the steam consumption per ton coal consumption is determined by the coal amount per ton, the environment-friendly system is improved, the cost is reduced by about 14980 RMB, the original cost is reduced by about 14911.3-5 RMB, the original cost is reduced by about 30 RMB cost, the original cost of operating cost of the original year operation, the original year operation is reduced by about 10.5710 RMB, the original year, the original cost of the original cost is reduced by about 10 year, the original cost.

Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.

The utility model discloses in operation, the flue gas that boiler body 5 produced separates the back through cyclone 6, the solid phase after the separation gets into in boiler body 5, the flue gas after the separation gets into inclosed flue 7, after the heat transfer through second grade air heater 17 and level air heater 16 with the air that times fan 4 came in flue 7, the air after being preheated reenters in boiler body 5, the flue gas after the heat transfer gets into dust remover 1 and removes dust, part of the flue gas after the dust removal is discharged through chimney 3 after desulfurization absorption tower 2 desulfurization, the other part of flue gas after the dust removal gets into in boiler body 5 through flue gas recirculation fan 15 and sixth pipeline 13, make the flue gas recirculation, partial times amount of wind has been replaced, and then under the big prerequisite that does not influence fluidization, times wind oxygen content has been reduced, oxygen deficiency burning has been realized, thereby the formation of nitrogen oxide has been suppressed, the index has been reduced.

Claims

The boiler comprises a boiler body, a cyclone separator and a closed flue, a smoke outlet end is arranged on the upper portion of the boiler body, a communicating end is arranged on the lower portion of the boiler body, the smoke outlet end of the boiler body and the upper feeding end of the cyclone separator are fixedly connected at , the bottom discharging end of the cyclone separator and the communicating end of the boiler body are connected at , the top smoke outlet end of the cyclone separator and the upper smoke inlet end of the flue are fixedly connected at , the lower smoke outlet end of the flue and the smoke inlet end of the dust remover are connected at through a pipeline, the smoke outlet end of the dust remover and the lower smoke inlet end of the desulfurization absorption tower are connected at through a second pipeline, the top smoke outlet end of the desulfurization absorption tower and the smoke inlet end of the chimney are connected at through a third pipeline, a lower portion of the boiler body and a second flue inlet end of the desulfurization absorption tower are respectively connected at the fifth pipeline, the air outlet end of the boiler body and the fifth pipeline are connected at the outer side of an air inlet air heat exchange pipeline of the boiler body, the fifth pipeline is connected at the fifth pipeline and the outer side of the boiler body, a 7342, and the inlet air inlet pipeline of the heat exchange unit is connected at the fifth pipeline of the fifth pipeline.
2. The boiler nitrogen oxide emission reduction device of claim 1, wherein the heat exchanger group comprises a -stage air preheater and a secondary air preheater, a -stage air preheater and a secondary air preheater are respectively and fixedly installed at the lower part of the inner cavity of the flue, a 0-stage air preheater is located above the secondary air preheater, air inlet ends are respectively arranged at the lower parts of a 1-stage air preheater and the secondary air preheater, an air outlet end is respectively arranged at the upper parts of a -stage air preheater and the secondary air preheater, the air outlet end of a -time fan and the air inlet end of the secondary air preheater are connected to the through a fourth pipeline, the air outlet end of the secondary air preheater and the air inlet end of a -stage air preheater are connected to the end, and the air outlet end of a -stage air preheater and the -th air inlet end of the boiler.
3. The device of claim 2, wherein the lower part of the right side of the boiler body is provided with an th air inlet end, the lower part of the left side of the boiler body is provided with a second air inlet end, the air outlet end of the -stage air preheater is connected with the th air inlet end of the boiler body through a fifth pipeline from , and a sixth pipeline is connected between the second pipeline and the second air inlet end of the boiler body.
4. The boiler nitrogen oxide emission reduction device of claim 1, 2 or 3, wherein an air inlet pipe is connected to an air inlet end of the times blower, and a silencer and an electric air are fixedly mounted on the air inlet pipe respectively.
5. The boiler nitrogen oxide emission reduction device according to claim 1, 2 or 3, wherein a communicating pipe is connected between the fifth pipeline and the sixth pipeline, an electric butterfly valve is fixedly installed on the communicating pipe, a pneumatic baffle valve and a manual butterfly valve are respectively fixedly installed on the sixth pipeline, electric air is fixedly installed on the second pipeline between the induced draft fan and the desulfurization absorption tower, and electric air is fixedly installed on the third pipeline.
6. The boiler nitrogen oxide emission reduction device of claim 4, wherein a communication pipe is connected between the fifth pipeline and the sixth pipeline, an electric butterfly valve is fixedly installed on the communication pipe, a pneumatic flapper valve and a manual butterfly valve are respectively fixedly installed on the sixth pipeline, electric air is fixedly installed on the second pipeline between the induced draft fan and the desulfurization absorption tower, and electric air is fixedly installed on the third pipeline.
7. The boiler nitrogen oxide emission reduction device according to claim 1, 2 or 3, wherein the dust remover is an electric bag dust remover.
8. The boiler nitrogen oxide emission reduction device of claim 4, wherein the dust remover is an electric bag dust remover.
9. The boiler nitrogen oxide emission reduction device of claim 5, wherein the dust remover is an electric bag dust remover.
10. The boiler nitrogen oxide emission reduction device of claim 6, wherein the dust remover is an electric bag dust remover.